| (19) |
 |
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(11) |
EP 0 043 651 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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31.03.1982 Bulletin 1982/13 |
| (43) |
Date of publication A2: |
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13.01.1982 Bulletin 1982/02 |
| (22) |
Date of filing: 11.06.1981 |
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| (84) |
Designated Contracting States: |
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BE DE FR GB IT NL |
| (30) |
Priority: |
23.06.1980 JP 8548680
|
| (71) |
Applicant: Takeda Chemical Industries, Ltd. |
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() |
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| (72) |
Inventors: |
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- Kamatani, Yoshio
()
- Fujita, Noriaki
()
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| |
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(57) Polyisocyanates having oxadiazinetrione rings obtained by reacting bis(isocyanatomethyl)cyclohexane,
an oligomer thereof, an adduct thereof or a mixture of them with carbon dioxide. Said
polyisocyanates have excellent properties as raw materials for the production of polyurethanes,
because of their higher reactivity at lower temperature and better storage stability.